Linear polarization of rapidly rotating ultracool dwarfs

Aims. We aim at studying the near infrared linear polarization signal of rapidly rotating ultracool dwarfs with spectral types ranging from M7 through T2 and projected rotational velocities vsini >= 30 km s^{-1}. All these dwarfs are believed to have dusty atmospheres and oblate shapes, an appropriate scenario to produce measurable linear polarization of the continuum light.\\ Methods. Linear polarimetric images were collected in the J-band for a sample of 18 fast-rotating ultracool dwarfs, five of which were also observed in the Z-band using the LIRIS spectrograph on the Cassegrain focus of the 4.2-m William Herschel Telescope. The measured median uncertainty in the linear polarization degree is +/-0.13% for our sample, which allowed us to detect polarization signatures above ~0.39% with a confidence of >=3\sigma.\\ Results. About 40+/-15% of the sample is linearly polarized in the Z- and J-bands. All positive detections have linear polarization degrees ranging from 0.4% to 0.8% in both filters independently of spectral type and spectroscopic rotational velocity. However, simple statistics point at the fastest rotators (vsini >=60 km s^{-1}) having a larger fraction of positive detections and a larger averaged linear polarization degree than the moderately rotating dwarfs (vsini=30--60 km s^{-1}). Our data suggest little linear polarimetric variability on short time scales (i.e., observations separated by a few ten rotation periods), and significant variability on long time scales (i.e., hundred to thousand rotation cycles), supporting the presence of "long-term weather" in ultracool dwarf atmospheres.Comment: 12 pages, 7 figures, recommended for publication in Astronomy and Astrophysic

Incidencia y vinculación

El PAP de migración en Jalisco tiene como propósito trabajar con organizaciones que apoyan personas migrantes y refugiadas, promoviendo sus derechos y mejorando las condiciones de sus procesos. El equipo de incidencia, se enfoca en la creación de espacios de trabajo y discusión que tienen como objetivo incidir en los procesos de movilidad humana en el estado. Continúa con el trabajo del semestre de primavera para la mejora de la Propuesta Ley de Retorno así como la participación del equipo en el Ciclo de la Comunidad Solidaria. Retoma una propuesta del PRAMI de 2019 para crear jornadas de diálogo de Sociedad Civil con actores de gobierno y organizaciones. En este periodo era fundamental realizar una sesión de trabajo para la Propuesta de Ley de Retorno, apoyo de investigación para la comunidad solidaria y producir una propuesta inicial para las jornadas de diálogo. Elegimos enfocar la mayoría de los esfuerzos a la mejora de la Propuesta de Ley de Retorno debido a la presión de tiempo causada por el próximo periodo electoral. Paralelamente distintos integrantes del equipo realizaban actividades relacionadas a los otros proyectos. El equipo presenta cómo productos principales una lista de propuestas de mejora para la Propuesta Ley de Retorno, directorios de organizaciones que tratan el tema de movilidad humana en Jalisco, infografías para la Comunidad Solidaria y la propuesta inicial para las jornadas de diálogo las cuáles se llevarán a cabo en el periodo de Otoño de este PAP.ITESO, A.C

FoodLab: estandarización de proceso y desarrollo de nuevos productos

En este PAP se realizó un trabajo de mejora de procesos y desarrollo de productos dentro de FOODLAB, una empresa dedicada a la elaboración de productos de gomitas. Después de una primera evaluación y juntas con la persona encargada de la empresa, se determinó que se realizarían procedimientos de estandarización de procesos y de desarrollo de nuevos productos. Para el desarrollo de nuevos productos, se trabajó con las Yummy Fruits, realizando diferentes experimentaciones en donde se variaban los agentes gelantes y edulcorantes, así como sus concentraciones, hasta que se obtuvo un producto con características de textura y sabor agradables. Posteriormente se realizaron investigaciones y cotizaciones para ingredientes funcionales y empaques que podrían ser utilizados para el producto final. En cuanto a la estandarización del proceso de producción de Yummy Shots se llevó a cabo la toma de datos de 9 corridas de producción, variando condiciones de temperaturas, presión y °Brix, de las cuales se analizaron los distintos datos obtenidos en cada una de ellas y se concentró la información en una tabla donde se aprecian de mejor manera las distintas variaciones. Además, se actualizó la ficha técnica del producto, obteniendo resultados más completos de análisis fisicoquímicos, microbiológicos y bromatológicos de los Yummy Shots, de los cuales existen 2 tipos: sin chile y con chile.ITESO, A.C

La imagen y la narrativa como herramientas para el abordaje psicosocial en escenarios de violencia en los municipios de Florencia y Curillo

El presente trabajo pretende evaluar en el paso 4, los eventos psicosociales traumáticos desde el enfoque narrativo y el análisis del relato para proponer recursos de afrontamiento psicosocial al sufrimiento por violencia. Como tarea 1, se profundizó en el relato de vida 3: Alfredo Campo a partir de unas preguntas orientadoras; así mismo, la tarea 2 permitió el análisis y formulación de una entrevista con preguntas de tipo estratégicas, circulares y reflexivas, para resolverlas con la persona protagonista del relato y así lograr un acercamiento psicosocial ético y proactivo en la superación de las condiciones de victimización. En la tarea 3, se comprenden en el caso expuesto de peñas coloradas y se amplían reflexiones, de acuerdo el caso de peñas coloradas, emprendiendo lo psicosocial partiendo los ítems, se manifiesta predominando la incursión y el encuentro militar que impactaron a la población estigmatizado como actor armado. Se proponen acciones de acompañamiento a la situación de crisis por el desarraigo presentada en la comunidad bridando apoyo a través de una matriz, estableciendo las estrategias psicosociales en los habitantes de peñas coloradas. Se anexan el informe analítico sobre la experiencia en la foto voz que se realizó el paso tres en el diplomado de acompañamiento en los escenarios de violencia, refieren a sus debidas conclusiones y en link del blog diseñada por el grupo colaborativo.The present work intends to evaluate in step 4, the psychosocial traumatic events from the narrative approach and the analysis of the story to propose psychosocial coping resources to the suffering due to violence. As task 1, we deepened in the life story 3: Alfredo Campo from some guiding questions; likewise, task 2 allowed the analysis and formulation of an interview with strategic, circular and reflective questions, to solve them with the protagonist of the story and thus achieve an ethical and proactive psychosocial approach in overcoming the conditions of victimization. task 3, the case of Peñas Coloradas is analyzed, generating reflections on its psychosocial approach based on some items, such as: what psychosocial emergencies are considered to be latent after the incursion and military harassment, and what impacts does it generate for the population to be stigmatized as an accomplice of an armed actor. Likewise, two support actions are proposed in the crisis generated by the uprooting suffered by the community and guidelines are given through a matrix to establish three psychosocial strategies with the inhabitants of Peñas Coloradas, which facilitate the empowerment of coping resources to the situation expressed. In addition, the analytical and reflective report of the experience of the photo voice carried out in step 3 of the diploma course in psychosocial accompaniment in scenarios of violence is attached, along with its conclusions and the link to the blog of the Wix page designed by the collaborative group

Close companions around young stars

Multiplicity is a fundamental property that is set early during stellar lifetimes, and it is a stringent probe of the physics of star formation. The distribution of close companions around young stars is still poorly constrained by observations. We present an analysis of stellar multiplicity derived from APOGEE-2 spectra obtained in targeted observations of nearby star-forming regions. This is the largest homogeneously observed sample of high-resolution spectra of young stars. We developed an autonomous method to identify double lined spectroscopic binaries (SB2s). Out of 5007 sources spanning the mass range of $\sim$0.05--1.5 \msun, we find 399 binaries, including both RV variables and SB2s. The mass ratio distribution of SB2s is consistent with a uniform for $q0.95$. The period distribution is consistent with what has been observed in close binaries ($<10$ AU) in the evolved populations. Three systems are found to have $q\sim$0.1, with a companion located within the brown dwarf desert. There are not any strong trends in the multiplicity fraction (MF) as a function of cluster age from 1 to 100 Myr. There is a weak dependence on stellar density, with companions being most numerous at $\Sigma_*\sim30$ stars/pc$^{-2}$, and decreasing in more diffuse regions. Finally, disk-bearing sources are deficient in SB2s (but not RV variables) by a factor of $\sim$2; this deficit is recovered by the systems without disks. This may indicate a quick dispersal of disk material in short-period equal mass systems that is less effective in binaries with lower $q$.Comment: 25 pages, 20 figures. Accepted to A

Variable stars in the VVV globular clusters. II. NGC6441, NGC6569, NGC6626 (M28), NGC6656 (M22), 2MASS-GC02, and Terzan10

© ESO 2021. This is the accepted manuscript version of an article which has been published in final form at https://doi.org/10.1051/0004-6361/202140546Context. The Galactic globular clusters (GGCs) located in the inner regions of the Milky Way suffer from high extinction that makes their observation challenging. High densities of field stars in their surroundings complicate their study even more. The VISTA Variables in the Via Lactea (VVV) survey provides a way to explore these GGCs in the near-infrared where extinction effects are highly diminished. Aims. We conduct a search for variable stars in several inner GGCs, taking advantage of the unique multi-epoch, wide-field, near-infrared photometry provided by the VVV survey. We are especially interested in detecting classical pulsators that will help us constrain the physical parameters of these GGCs. In this paper, the second of a series, we focus on NGC 6656 (M 22), NGC 6626 (M 28), NGC 6569, and NGC 6441; these four massive GGCs have known variable sources, but quite different metallicities. We also revisit 2MASS-GC 02 and Terzan 10, the two GGCs studied in the first paper of this series. Methods. We present an improved method and a new parameter that efficiently identify variable candidates in the GGCs. We also use the proper motions of those detected variable candidates and their positions in the sky and in the color-magnitude diagrams to assign membership to the GGCs. Results. We identify and parametrize in the near-infrared numerous variable sources in the studied GGCs, cataloging tens of previously undetected variable stars. We recover many known classical pulsators in these clusters, including the vast majority of their fundamental mode RR Lyrae. We use these pulsators to obtain distances and extinctions toward these objects. Recalibrated period-luminosity-metallicity relations for the RR Lyrae bring the distances to these GGCs to a closer agreement with those reported by Gaia, except for NGC 6441, which is an uncommon Oosterhoff III GGC. Recovered proper motions for these GGCs also agree with those reported by Gaia, except for 2MASS-GC 02, the most reddened GGC in our sample, where the VVV near-infrared measurements provide a more accurate determination of its proper motions.Peer reviewe

Adolescents opinions regarding Plato del Bien Comer Maya as nutrition health promotion tool

Conocer opiniones sobre el Plato del Bien Comer Maya de adolescentes de Cholul, Yucatán, para mejorar la herramienta comunicativa y utilizarla en actividades de promoción de la salud. Material y métodos. Estudio cualitativo, de investigación formativa. Se realizaron tres grupos focales, participaron 28 adolescentes de secundaria: 12-16 años. Criterios de inclusión: pertenecer a alguno de los tres grados de la escuela y tener familias originarias del poblado. El análisis de los datos se realizó manualmente. Resultados. En comparación con el Plato del Bien Comer nacional, el Plato Maya fue mejor identificado por tener elementos locales a los que pueden acceder fácilmente y con costos menores. Se identificó la palabra fruto como una variación lingüística que representa en ese contexto tanto a las frutas como a las verduras. Conclusiones. Para tener mejores resultados en intervenciones nutricionales es necesario diseñar estrategias educativo-comunicativas acordes con la cultura local.To know opinions of adolescents from Cholul, Yucatán, about Plato del Bien Comer Maya in order to improve it as health promotion tool. Qualitative study, formative research. Three focus groups were carried out, participating 28 adolescents: 12-16 years old. Criteria of inclusion: studying middle school; to have native family from the town. Analysis of the data made manually. Results. Comparatively with the national Plato del Bien Comer, the Plato Maya was better identified because have local food products easier to obtain and cheaper. The principal finding was to understand Fruto is a linguistic variation word which represents in Maya context both fruits and vegetables. This might be an important key to improve health promotion activities with that population. In order to have better results in nutritional interventions, it is necessary to design educational-communicative strategies in accordance with the local culture.Fil: Zulema Morayma Cabrera Araujo. Universidad Autónoma de Yucatán; MéxicoFil: Víctor Hernández Escalante. Universidad Autónoma de Yucatán; MéxicoFil: Alina Marín Cárdenas. Universidad Autónoma de Yucatán; MéxicoFil: Rocío Murguía Argüelles. Universidad de Oriente; MéxicoFil: Noel Magaña Be. Universidad de Oriente; MéxicoFil: Karla Ramón Escobar. Universidad de Oriente; MéxicoFil: Javier Hirose López. Universidad de Oriente; MéxicoFil: Lázaro Tuz Chi. Universidad de Oriente; MéxicoFil: Abril Salas Góngora. Universidad de Oriente; MéxicoFil: Joed Peña Alcocer. Universidad de Oriente; MéxicoFil: Tumas, Natalia. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Córdoba. Centro de Investigaciones y Estudios sobre Cultura y Sociedad. Universidad Nacional de Córdoba. Centro de Investigaciones y Estudios sobre Cultura y Sociedad; ArgentinaFil: Carlos Castro Sansores. Universidad Autónoma de Yucatán; MéxicoFil: Clara Juárez Ramírez. Instituto de Salud Pública de México; Méxic

VISIONS:the VISTA Star Formation Atlas I. Survey overview

VISIONS is an ESO public survey of five nearby (d &lt; 500 pc) star-forming molecular cloud complexes that are canonically associated with the constellations of Chamaeleon, Corona Australis, Lupus, Ophiuchus, and Orion. The survey was carried out with the Visible and Infrared Survey Telescope for Astronomy (VISTA), using the VISTA Infrared Camera (VIRCAM), and collected data in the near-infrared passbands J (1.25 μm), H (1.65 μm), and KS (2.15 μm). With a total on-sky exposure time of 49.4h VISIONS covers an area of 650 deg2, it is designed to build an infrared legacy archive with a structure and content similar to the Two Micron All Sky Survey (2MASS) for the screened star-forming regions. Taking place between April 2017 and March 2022, the observations yielded approximately 1.15 million images, which comprise 19 TB of raw data. The observations undertaken within the survey are grouped into three different subsurveys. First, the wide subsurvey comprises shallow, large-scale observations and it has revisited the star-forming complexes six times over the course of its execution. Second, the deep subsurvey of dedicated high-sensitivity observations has collected data on areas with the largest amounts of dust extinction. Third, the control subsurvey includes observations of areas of low-to-negligible dust extinction. Using this strategy, the VISIONS observation program offers multi-epoch position measurements, with the ability to access deeply embedded objects, and it provides a baseline for statistical comparisons and sample completeness – all at the same time. In particular, VISIONS is designed to measure the proper motions of point sources, with a precision of 1 mas yr−1 or better, when complemented with data from the VISTA Hemisphere Survey (VHS). In this way, VISIONS can provide proper motions of complete ensembles of embedded and low-mass objects, including sources inaccessible to the optical ESA Gaia mission. VISIONS will enable the community to address a variety of research topics from a more informed perspective, including the 3D distribution and motion of embedded stars and the nearby interstellar medium, the identification and characterization of young stellar objects, the formation and evolution of embedded stellar clusters and their initial mass function, as well as the characteristics of interstellar dust and the reddening law

VISIONS:the VISTA Star Formation Atlas I. Survey overview

VISIONS is an ESO public survey of five nearby (d &lt; 500 pc) star-forming molecular cloud complexes that are canonically associated with the constellations of Chamaeleon, Corona Australis, Lupus, Ophiuchus, and Orion. The survey was carried out with the Visible and Infrared Survey Telescope for Astronomy (VISTA), using the VISTA Infrared Camera (VIRCAM), and collected data in the near-infrared passbands J (1.25 μm), H (1.65 μm), and KS (2.15 μm). With a total on-sky exposure time of 49.4h VISIONS covers an area of 650 deg2, it is designed to build an infrared legacy archive with a structure and content similar to the Two Micron All Sky Survey (2MASS) for the screened star-forming regions. Taking place between April 2017 and March 2022, the observations yielded approximately 1.15 million images, which comprise 19 TB of raw data. The observations undertaken within the survey are grouped into three different subsurveys. First, the wide subsurvey comprises shallow, large-scale observations and it has revisited the star-forming complexes six times over the course of its execution. Second, the deep subsurvey of dedicated high-sensitivity observations has collected data on areas with the largest amounts of dust extinction. Third, the control subsurvey includes observations of areas of low-to-negligible dust extinction. Using this strategy, the VISIONS observation program offers multi-epoch position measurements, with the ability to access deeply embedded objects, and it provides a baseline for statistical comparisons and sample completeness – all at the same time. In particular, VISIONS is designed to measure the proper motions of point sources, with a precision of 1 mas yr−1 or better, when complemented with data from the VISTA Hemisphere Survey (VHS). In this way, VISIONS can provide proper motions of complete ensembles of embedded and low-mass objects, including sources inaccessible to the optical ESA Gaia mission. VISIONS will enable the community to address a variety of research topics from a more informed perspective, including the 3D distribution and motion of embedded stars and the nearby interstellar medium, the identification and characterization of young stellar objects, the formation and evolution of embedded stellar clusters and their initial mass function, as well as the characteristics of interstellar dust and the reddening law

VISIONS: The VISTA Star Formation Atlas -- I. Survey overview

© The Authors 2023. Open Access article, published by EDP Sciences, under the terms of the Creative Commons Attribution License (https://creativecommons.org/licenses/by/4.0).VISIONS is an ESO public survey of five nearby (d < 500 pc) star-forming molecular cloud complexes that are canonically associated with the constellations of Chamaeleon, Corona Australis, Lupus, Ophiuchus, and Orion. The survey was carried out with VISTA, using VIRCAM, and collected data in the near-infrared passbands J, H, and Ks. With a total on-sky exposure time of 49.4 h VISIONS covers an area of 650 deg$^2$, and it was designed to build an infrared legacy archive similar to that of 2MASS. Taking place between April 2017 and March 2022, the observations yielded approximately 1.15 million images, which comprise 19 TB of raw data. The observations are grouped into three different subsurveys: The wide subsurvey comprises shallow, large-scale observations and has visited the star-forming complexes six times over the course of its execution. The deep subsurvey of dedicated high-sensitivity observations has collected data on the areas with the largest amounts of dust extinction. The control subsurvey includes observations of areas of low-to-negligible dust extinction. Using this strategy, the VISIONS survey offers multi-epoch position measurements, is able to access deeply embedded objects, and provides a baseline for statistical comparisons and sample completeness. In particular, VISIONS is designed to measure the proper motions of point sources with a precision of 1 mas/yr or better, when complemented with data from VHS. Hence, VISIONS can provide proper motions for sources inaccessible to Gaia. VISIONS will enable addressing a range of topics, including the 3D distribution and motion of embedded stars and the nearby interstellar medium, the identification and characterization of young stellar objects, the formation and evolution of embedded stellar clusters and their initial mass function, as well as the characteristics of interstellar dust and the reddening law.Peer reviewe